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  <text>.NET standard ToolTips are not reliable when used on UserControl based visual widgets.  Essentially doing any number of normal things to the control or to other controls on the form can suddenly cause ToolTips that are still defined to simply stop appearing.  The classic example was with the compact (not expanded) Measurement widget, where tooltips would appear normally, until the value was clicked and the expanded form displayed.  After any edits were made, and the form was closed, tooltips on the Measurement widget would no longer function.

There was a discussion on a VB .NET forum describing this exact same problem, and the workaround they suggested does seem to fix the problems we are seeing as well.  Their fix was to essentially set the tooltip on MouseEnter of the control, and to clear the tooltip (set it to string.Empty) on MouseLeave.  This amounts to a lot more work than tooltips should be worth, and really points to an underlying problem with them in the first place.  

It may be well worth our time to find a tooltip replacement that functions properly.</text>
  <last_update>2007-10-04T00:52:30.1730806Z</last_update>
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